Created Unassigned: Folders are not getting initialized [1754]

I an new with IMAPX library. I am using the sample code provided on the IMAPX home page. I got an null reference exception while trying to get mails from Inbox, after debugging came to know that this exception is thrown by 'Folders' initialization. All the folders are set as null because of which I am receiving this error.

Please help I need to implement this in one of my projects.

Thanks in Advance